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Available-For-Sale And Held-To-Maturity Securities (Contractual Maturities) (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]    
Available-for-sale Securities, debt maturities, within one year, Fair Value $ 26,980 [1] $ 6,871
Available-for-sale Securities, debt maturities, after one year through five, Fair Value [1] 672,150  
Available-for-sale Securities, debt maturities, after five through ten years, fair value 453,334 [1] 411,680
Availably-for-sale Securities, debt maturities, after ten years, Fair Value 2,213,626 [1] 2,176,517
Available-for-sale Securities, debt maturities, Fair Value 3,366,090 [1] 3,254,737
Held-to-maturity Securities, debt maturities, after five year through ten, Amortized Cost 686,300 598,250
Held-to-maturity Securities, debt maturities, after ten years, Amortized Cost 2,399,524 2,257,969
Held-to-maturity Securities, Amortized cost 3,085,824 $ 2,856,219
U.S. Government Agency Securities [Member]    
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]    
Available-for-sale Securities, debt maturities, within one year, Fair Value [1] 1,761  
Available-for-sale Securities, debt maturities, after one year through five, Fair Value [1] 3,889  
Available-for-sale Securities, debt maturities, Fair Value [1] 5,650  
State And Municipal Securities [Member]    
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]    
Available-for-sale Securities, debt maturities, after five through ten years, fair value [1] 2,463  
Availably-for-sale Securities, debt maturities, after ten years, Fair Value [1] 14,679  
Available-for-sale Securities, debt maturities, Fair Value [1] 17,142  
Corporate Fixed Income Securities [Member]    
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]    
Available-for-sale Securities, debt maturities, within one year, Fair Value [1] 25,186  
Available-for-sale Securities, debt maturities, after one year through five, Fair Value [1] 628,151  
Available-for-sale Securities, debt maturities, after five through ten years, fair value [1] 74,253  
Available-for-sale Securities, debt maturities, Fair Value [1] 727,590  
Asset-Backed Securities [Member]    
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]    
Available-for-sale Securities, debt maturities, after five through ten years, fair value [1] 375,832  
Availably-for-sale Securities, debt maturities, after ten years, Fair Value [1] 1,293,613  
Available-for-sale Securities, debt maturities, Fair Value [1] 1,669,445  
Held-to-maturity Securities, debt maturities, after five year through ten, Amortized Cost 686,300  
Held-to-maturity Securities, debt maturities, after ten years, Amortized Cost 2,399,524  
Held-to-maturity Securities, Amortized cost 3,085,824  
Mortgage Backed Securities [Member] | Agency [Member]    
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]    
Available-for-sale Securities, debt maturities, within one year, Fair Value [1] 33  
Available-for-sale Securities, debt maturities, after one year through five, Fair Value [1] 676  
Available-for-sale Securities, debt maturities, after five through ten years, fair value [1] 786  
Availably-for-sale Securities, debt maturities, after ten years, Fair Value [1] 827,938  
Available-for-sale Securities, debt maturities, Fair Value [1] 829,433  
Mortgage Backed Securities [Member] | Commercial [Member]    
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]    
Available-for-sale Securities, debt maturities, after one year through five, Fair Value [1] 31,607  
Availably-for-sale Securities, debt maturities, after ten years, Fair Value [1] 76,579  
Available-for-sale Securities, debt maturities, Fair Value [1] 108,186  
Mortgage Backed Securities [Member] | Non-Agency [Member]    
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]    
Available-for-sale Securities, debt maturities, after one year through five, Fair Value [1] 7,827  
Availably-for-sale Securities, debt maturities, after ten years, Fair Value [1] 817  
Available-for-sale Securities, debt maturities, Fair Value [1] $ 8,644  
[1] Due to the immaterial amount of income recognized on tax-exempt securities, yields were not calculated on a tax-equivalent basis.